Abstract
Abstract This paper presents the results from a numerical investigation of the responses of stratified airflow to prescribed near-surface mesoscale axisymmetric (circular) and elongated (elliptical) heat sources under uniform basic wind conditions using a simple three-dimensional model. Model results indicate that the structure of the response depends on the Froude number (Fr = V/NH) and the Rossby number (Ro = V/fL) associated with an axisymmetric thermal forcing, where H and L are the vertical and horizontal scales of the heat source, V the wind speed, N the Brunt-Vaisala frequency, and f the Coriolis parameter. However, the response to an elongated thermal forcing depends not only on the Froude and Rossby numbers, but also on the ratio of the alongstream scale (Ls) to the cross-stream scale (Ln) of the heat source, which are determined by the horizontal shape of the heat source and the direction of the basic flow. When Ls/Ln is less than 1, that is, the heat source is elongated in the cross-stream dire...
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